1hkg
From Proteopedia
(New page: 200px<br /> <applet load="1hkg" size="450" color="white" frame="true" align="right" spinBox="true" caption="1hkg, resolution 3.5Å" /> '''STRUCTURAL DYNAMICS ...) |
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| - | [[Image:1hkg.gif|left|200px]]<br /> | + | [[Image:1hkg.gif|left|200px]]<br /><applet load="1hkg" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1hkg" size=" | + | |
caption="1hkg, resolution 3.5Å" /> | caption="1hkg, resolution 3.5Å" /> | ||
'''STRUCTURAL DYNAMICS OF YEAST HEXOKINASE DURING CATALYSIS'''<br /> | '''STRUCTURAL DYNAMICS OF YEAST HEXOKINASE DURING CATALYSIS'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The binding of the substrate glucose to yeast hexokinase results in a | + | The binding of the substrate glucose to yeast hexokinase results in a substantial enzyme conformational change that is essential for catalysis and may be important for the enzyme's specificity, as well as the control of its activity. From high-resolution crystal structures of the monomeric enzyme crystallized both in the presence and in the absence of glucose, we find that glucose binds into the deep cleft that separates the molecule into two lobes and causes these two lobes to move together and close off the cleft. The structure of the hexokinase crystallized in the presence of xylose and ADP is being determined at low resolution. In this crystal form, the enzyme was thought to be in the conformation of the ternary complex. However, a low-resolution structure of this crystal form shows clearly that the enzyme is in the 'open' form and is not a ternary complex. Crystals of the A isozyme with glucose and ADP may be. Further, chemically sequenced tryptic peptides are being incorporated into the model obtained by crystallographic refinement at 2.1 A resolution. Completion of the sequence and the structure of the ternary complex should allow a detailed description of the enzymatic mechanism of this kinase and the role of substrate-induced conformational changes in catalysis and control. |
==About this Structure== | ==About this Structure== | ||
| - | 1HKG is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ]. The following page contains interesting information on the relation of 1HKG with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb50_1.html The Glycolytic Enzymes]]. Active as [http://en.wikipedia.org/wiki/Hexokinase Hexokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.1 2.7.1.1] Full crystallographic information is available from [http:// | + | 1HKG is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ]. The following page contains interesting information on the relation of 1HKG with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb50_1.html The Glycolytic Enzymes]]. Active as [http://en.wikipedia.org/wiki/Hexokinase Hexokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.1 2.7.1.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HKG OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: The Glycolytic Enzymes]] | [[Category: The Glycolytic Enzymes]] | ||
| - | [[Category: Bennettjunior, W | + | [[Category: Bennettjunior, W S.]] |
| - | [[Category: Steitz, T | + | [[Category: Steitz, T A.]] |
[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:02:13 2008'' |
Revision as of 11:02, 21 February 2008
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STRUCTURAL DYNAMICS OF YEAST HEXOKINASE DURING CATALYSIS
Overview
The binding of the substrate glucose to yeast hexokinase results in a substantial enzyme conformational change that is essential for catalysis and may be important for the enzyme's specificity, as well as the control of its activity. From high-resolution crystal structures of the monomeric enzyme crystallized both in the presence and in the absence of glucose, we find that glucose binds into the deep cleft that separates the molecule into two lobes and causes these two lobes to move together and close off the cleft. The structure of the hexokinase crystallized in the presence of xylose and ADP is being determined at low resolution. In this crystal form, the enzyme was thought to be in the conformation of the ternary complex. However, a low-resolution structure of this crystal form shows clearly that the enzyme is in the 'open' form and is not a ternary complex. Crystals of the A isozyme with glucose and ADP may be. Further, chemically sequenced tryptic peptides are being incorporated into the model obtained by crystallographic refinement at 2.1 A resolution. Completion of the sequence and the structure of the ternary complex should allow a detailed description of the enzymatic mechanism of this kinase and the role of substrate-induced conformational changes in catalysis and control.
About this Structure
1HKG is a Protein complex structure of sequences from [1]. The following page contains interesting information on the relation of 1HKG with [The Glycolytic Enzymes]. Active as Hexokinase, with EC number 2.7.1.1 Full crystallographic information is available from OCA.
Reference
Structural dynamics of yeast hexokinase during catalysis., Steitz TA, Shoham M, Bennett WS Jr, Philos Trans R Soc Lond B Biol Sci. 1981 Jun 26;293(1063):43-52. PMID:6115422
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